Unit test files are identified in the project's configuration with a series of
wild card patterns matching files in the project, or by flagging individual
files as test files. The Testing tool lists these test files and provides a
convenient way to execute all tests, all tests in a file, tests selected in
the Testing tool or editor, or all previously failed tests. Test results are
displayed clearly using pass and fail icons. When tests fail, clicking on the
test displays the point of failure, its output, and the exception that
occurred. Test result summaries can be copied and pasted from the Testing
tool for sharing with team members.

Wing can run unit tests in the debugger, so that execution stops immediately
on individual test failures and all of the debugger's tools can be used in
isolating, diagnosing, and fixing the failure. Running unit tests in the
debugger is also a great way to write new code because it shortens the edit/debug
cycle and supports using the Debug Probe and editor to write code within the
live runtime state of your application.